staleness vs stale

staleness is a noun but stale is not a noun.

Word	Noun	Adjective	Verb	Adverb
staleness	Yes	No	No	No
stale	No	Yes	Yes	No

staleness (noun)	stale (noun)
having lost purity and freshness as a consequence of aging
unoriginality as a result of being dull and hackneyed

staleness (adjective)	stale (adjective)
	lacking freshness, palatability, or showing deterioration from age
	lacking originality or spontaneity; no longer new

staleness (verb)	stale (verb)
	urinate, of cattle and horses